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unit 1 physics a.newton's second law b.radioactivity and nuclear physics c.the atom and its nucleus d.solids, liquids and gases e.laser f.speed barrier of planesunit 2 electronics and bionics a.electrical eyes and hands b.wireless-set c.bionic men d.electric fishes e.plant scanning f.artificial intelligenceunit 3 biology a.the evolution of life on the earth b.animal and music c.insects eating d.animal communication e.island biogeography f.an explosive end of dinosaurs g.mosquito h.saving whalesunit 4 astronomy and geology a.black hole b.global warming and climate change c.the yellow river d.aurora e.volcano f.age of the earth sunbeams h.antarctica i.erosion of rocks j.evidence for atlantis k.rainbows l.the origin of rivers m.our solar system n.earthquakeunit 5 chemistry a.artificial fertilizers b.organic chemistry c.petroleum d.chemistry molecules e.pesticideunit 6 medicine a.first aid and home safety b.inflammation and fever c.neurasthenia d.the science of genetics e.vitaminunit 7 physiology and psychology a.the placebo effect b.your memory at work c.human sleep d.food and thought e.why we laugh e.tears g.sense of cold h.bones i.fatiguereferences